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Murizam Darus
Preferred name
Murizam Darus
Official Name
Murizam, Darus
Alternative Name
Murizam, D.
Darus, M.
Darus, Murizam
Main Affiliation
Scopus Author ID
55560769800
Researcher ID
GBJ-8265-2022
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1 - 10 of 10
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PublicationThe hydrothermal synthesis of TiO₂-GO with enhance photocatalytic activityA composite material consisting of titanium dioxide and graphene oxide (TiO₂–GO) was synthesized through a hydrothermal reaction. This reaction involved the use of Ti(SO4)2 in an ethanol–water solvent. Different content of GO was studied to find the optimum parameter. The composites were subjected to characterization, encompassing an examination of their composition, structure, and microstructure through techniques such as X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), and ultraviolet-visible diffuse reflectance spectroscopy. For Raman spectra, the presence of a G-band at approximately 1599 cm-1 and a D-band at 1350 cm-1 in the spectra indicates the presence of graphene oxide (GO). Therefore, the modified Hummer method synthesized graphite to GO. The findings for the XRD spectrum concerning the TiO2–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Diffraction pattern similar to pristine TiO₂, only for TiO2–GO(0.75) and the peak for rutile TiO2 at 2Ɵ values 27.08° for both technique and TiO₂–GO(0.5) for spray technique. Apparently, GO sheets were almost covered by anchored TiO₂ particles, providing the possibility of efficient electronic conducting and electron transportation as in the SEM microstructures. EDS analysis shows the excessive carbon element for TiO₂-GO(0.75) and TiO₂-GO(1). The findings concerning the TiO₂–GO composites revealed the presence of finely dispersed anatase TiO₂ particles on the surface of the graphene oxide sheet layer. Notably, the photocatalytic performance of the TiO₂–GO composite significantly surpassed that of pure TiO₂ in the photodegradation of methyl blue (MB) when exposed to sunlight. The spray technique had a higher photocatalytic degradation percentage which is 82% for TiO₂-GO(0.25) compared to the dropped technique 79% which is TiO₂-GO(0.5). Degradation analysis of methyl blue concluded that the improved photocatalytic activity of TiO₂–GO primarily results from the enhanced efficiency in trapping and transporting electrons, which can be attributed to the presence of graphene oxide (GO).
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PublicationLogam Ferus(Penerbit UniMAP, 2011)
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PublicationLogam bukan ferusUmum mengetahui kepentingan bahan logam dalam kehidupan manusia seharian. Walaubagaimanapun, tidak ramai yang mempunyai pemahaman jelas berkaitan dengan bahan ini. Situasi ini mengilhamkan para penulis untuk menghasilkan buku Logam Bukan Ferus ini. Bab pertama menjelaskan berkenaan logam bukan ferus secara umum, pola penggunaan logam bukan ferus serta masa depan logam bukan ferus ini. Bab-bab lain pula memberikan fokus kepada beberapa jenis bahan bukan ferus secara spesifik seperti aluminium, zink, plumbum, kuprum, logam refraktori dan logam berharga.
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PublicationErgonomic study of X-L wheelchairWheelchairs have been used widely as the one of the vehicles that are designated purposely to help the disabled patient to easily move around. However, the standard wheelchairs currently available in the market are mostly fit to patients which have average size and can only accommodate the patient with maximum body mass up to 100kg. When a big size or extra-large (XL) patient with body mass more than 100 kg uses this standard wheelchair, they may feel discomfort, cramped as well as restricted movement. Furthermore, the structure of standard wheelchairs may not be safe enough to hold the load of big size patient weight. Therefore, this project is focused to study the appropriate an ergonomic body sizes and dimensions of big patients that body mass ranging from minimum 100kg to maximum 150kg. The investigation is focused on the customer needs as well as anthropometry body measurements. The data was collected from the questionnaires and direct interview among 30 personnel with the body mass in target range. The information gathered then had been used to custom design the XL wheelchair that fulfil the most requirements and having sturdy structure that safety to be used.
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PublicationNear surface studies on the role of graphene oxide in the carbon species activities in it-sofc cathode materials( 2020-01-01)
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PublicationLogam ferusLogam ferus adalah kumpulan logam dengan komposisi utamanya terdiri daripada bahan logam besi. Pengetahuan berkaitan bahan ini dapat membantu kita menghasilkan produk yang lebih berkualiti serta mengoptimakan penggunaan bahan ferus dengan lebih cekap. Bab pertama menjelaskan berkenaan logam ferus secara umum, proses penghasilan logam ferus serta piawai yang menjadi rujukan utama industri berkaitan. Bab kedua buku ini pula memberikan fokus kepada sifat-sifat logam ferus serta peranan utama bahan karbon dalam penghasilan keluli. Jenis-jenis keluli yang utama pula dijelaskan dalam bab tiga. Manakala bahagian terakhir menjelaskan proses-proses yang berkaitan dengan penghasilan produk daripada bahan logam ferus.
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PublicationPreliminary Study of Hydrothermal Synthesis of TiO2-GO Composites as a High Performance Photocatalyst( 2020-11-24)
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PublicationEffects of solution treatment temperature on the mechanical properties of commercial recycled aluminium alloy cylinder head (A319)( 2010)The present work was performed to investigate the effect of different solution treatment temperature on commercial recycled aluminium alloy cylinder head during artificial ageing process. All samples were sectioned from recycled automotive cylinder head and solution heat treated at 495°C, 510°C and 525°C each for a period of 10 hours. All samples were then quenched into ice water at 0°C and followed by artificial ageing at 180°C for a time up to 20 hours. The precipitation behaviours was monitored by Vicker’s microhardness test and electrical resistivity measurement. Precipitation occurrence were characterised by thermal analysis method and SEM/EDX technique on critical sample. The effect of heat treatment processes was observed by metallographic technique. It is seen that the aluminium alloy exhibit age hardening response similar to artificial ageing where as the the peak-age hardening accelerated when higher solution temperature applied. The hardening effect achieved was due to precipitation of metastable phases of θ˝/θ΄, β˝/β΄, and Q˝Q΄ except for 495°C where the coarser silicon particles contributes to the peak-aged hardening. Silicon particle were fragmentised and spherodised during high temperature solution treatment and homogenised into the aluminium matrix. Prolonged artificial ageing resulting the silicon particles to growth and reduces the nucleation site for phases precipitation, thus reduce the aluminium alloy hardening.
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PublicationHard-porous-lightweight PM Fe-Cr-Al2O3MMCs sintered under hybrid microwave energyThis study reports on the effect of Al2O3 particles on the density of Fe-Cr metal matrix composite (MMCs) produced through PM route then sintered under hybrid microwave energy. The sample was prepared by mixing the Al2O3 particle in 3D-tubular shaker at six different weight percentage of Fe-Cr matrix started from 5 wt.% to 30 wt.% with 5% in increment. The sintering process was performed under controlled N2 atmosphere in a tubular microwave furnace. Determination of bulk density and porosity was done according to Standard Test Method ASTM B962 - 17, while ASTM E384 was used to determine the microhardness. Assessment of the sample was based on density, porosity, hardness and microstructure evaluation. The result show that incorporating the Al2O3 particle were significantly increase the microhardness, decrease the bulk density and increase the porosity of the in Fe-Cr composite.
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PublicationOptimization of heating rate on hybrid microwave sintering of the PM Fe-Cr MMCs reinforced with Al2O3particleThis study reports the optimization of heating rate on the microwave sintered Fe-Cr-Al2O3 metal matrix composite (MMC). The heating rate was selected between 10°C/min to 60°C/min with increment of 10°C/min respectively. The samples were fabricated via PM route and microwave sintering was carried out in a tubular microwave furnace HAMiLab-V3 in N2 atmosphere purposely to avoid any oxidation and chemical reaction to samples. The microstructure of sintered samples was evaluated using SEM and bulk density and porosity were determined based on ASTM B962 - 17 and the microhardness were determined based on ASTM E384. The optimized heating rate of the sample was selected based on the micro hardness value and total porosity percentage as well as based on SEM microstructure analysis. The results revealed that the optimum heating rate occurred at 20°C/min due to the highest value of hardness achieved which is about 119.28 HV with at the highest bulk density about 6.07 g/cm3 and at the lowest total porosity about 14.55%. SEM micrographs also showed that the diffusion was mostly effective at 20°C/min heating rate compared to others, indicated that significant grain boundary diffusion of Fe matrix into Al2O3 particle was occurred.
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